Screw Ring Gauges

Go or Not Go solid Screw Ring Gauges manufactured to the latest British, American and International standards. Most common thread forms are: ISO metric, UN (unified), Whitworth (BSF BSW), Pipe (BSP to ISO228) B.A., BSC (cycle), Aeronautical (MJ, UNJ), wire insert, Acme, Stub Acme, Trapezoidal, Buttress, Rd (round), Pg, NPSI, NPSF, NPSM,

In ISO metric threads the various classes of external threads are 4h, 6g and 8g, In Unified threads the various classes of external threads are 1A, 2A and 3A. Whitworth and B.A. the various classes of thread are Close, Medium and Free, Please contact us for any other thread form you may require.